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R30006 Cobalt vs. ASTM A387 Grade 9 Steel

R30006 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 9 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
20 to 21
Fatigue Strength, MPa 260
160 to 240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 900
500 to 600
Tensile Strength: Yield (Proof), MPa 540
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
10

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
2.1
Embodied Energy, MJ/kg 110
28
Embodied Water, L/kg 500
87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 670
140 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
18 to 21
Strength to Weight: Bending, points 24
18 to 20
Thermal Diffusivity, mm2/s 3.9
6.9
Thermal Shock Resistance, points 26
14 to 17

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.15
Chromium (Cr), % 27 to 32
8.0 to 10
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
87.1 to 90.8
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0 to 1.0
0.9 to 1.1
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 4.0 to 6.0
0
Vanadium (V), % 0
0 to 0.040